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ECAT Chemistry Chemical Equilibrium Test Online

Maan AliLast Updated: April 19, 2025

Chemistry Chemical Equilibrium MCQS Online Test

ECAT Chemistry Chemical Equilibrium Chapter Online Test

Total Questions:	63
Time Allowed:	30 Minutes
Total Marks:	63
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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ECAT Chemistry Chemical Equilibrium Test

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Page 1 of 3

Chemistry

1. The product of [0H¯][H⁺] at 25C° is

10¯²⁰

10¯¹⁴

10¯¹⁰

10¹⁰

2. Units of Kc is

Moles¯² dm⁺⁶

Moles² dm⁺⁶

Kc may or may not have units

Moles⁺² dm¯⁶

3. Solubility of any salt can be determined from

Ksp

4. If the value of kc is very low then the forward reaction will occur __________

Fast

Moderately

Randomly

Slowly

5. Which statements are correct for a reaction at equilibrium?
(I) The forward and reverse reactions both continue
(II) The rates of the forward and reverse reactions are equal
(III) The concentrations of reactants and products are equal

I, II and III only

I and III only

I and II only

II and III only

6. In an exothermic reaction, a 10° rise in temperature will

Decrease the value of equilibrium constant

Produce some increase in Kc

Not produce any change in Kc

Double the value of Kc

7. In a chemical reaction N₂ + 3H₂ ⇌ 2NH₃ at equilibrium point

The reaction has stopped

Equal volumes of N₂ and H₂ are reacting

Equal masses of N₂ and H₂ are reacting

The same amount of ammonia is formed as is decomposed into N₂ and H₂

8. For the reaction 2A(g) + B(g) ⇌ 3C(g) + D(g) two moles each of A and B were taken into a flask. The following must always be true when the system attained equilibrium

[B] = [C]

[A] < [B]

[A] > [C]

[A] = [B]

9. If rate of concentration of reaction is equal to rate of concentration of products in reversible reaction the __________

Reaction goes backward

Reaction stops after some time

Equilibrium will established

Reaction goes forward

10. Who studied the effect of temperature on equilibrium?

Vant Hoff

Van der Waal

Arrhenius

Lewis

11. When pressure is applied to the equilibrium system Ice ⇌ Water? Which of the following phenomenon will happen?

Equilibrium will not be formed

More water will be formed

More ice will be formed

Water will evaporate

12. A chemical reaction A ⇌ B is said to be in equilibrium when

Conversion of A to B is only 50% complete

Only 10% conversion of A to B has taken place

Complete conversion of A to B has taken place

The rate of transformation of A to B is just equal to rate of transformation of B to A in the system.

13. When pressure is applied to the given equilibrium ice water which of the following will happen

Equilibrium will not be disturbed

More ice will be formed

Water will formed

More water will be formed

14. When rate of forward reaction is equal to rate of backward reaction, then the equilibrium established is called

Dynamic equilibrium

Static equilibrium

None of all

Chemical equilibrium

15. The reaction 2SO₂ + 2O₂ ⇌ 2SO will be favoured by

High temperature and low pressure

Low temperature and high pressure

High temperature and high pressure

Low temperature and low pressure

16. Which one of the following is a buffer solution?

Solution of CuSO4

Brine

Blood

Glue

17. Chemical equilibrium is referred to as dynamic because, at equilibrium, the

Reactants and products keep reacting

Rates of the forward and backward reactions change

Concentrations of the reactants and products continue to change

Equilibrium constant changes

18. What is the relationship between kp and kc?

Kc - kp (RT)∆n

kc = kp (P)-∆n

kp = kc (RT)∆n

kp = kc (RT)-∆n

19. Synthesis of ammonia by Habor process is an example of ___________

Constant Reaction

Decomposition Reaction

Reversible Reaction

Irreversible Reaction

20. Which of the following aqeous solution will be basic?

Fecl₃₋

Na₂SO₄

NaCl

Na₂CO₃

21. Which of the following gives a basic buffer?

NaOH + CH₃ COONa

NaOH + NaCl

NH₄OH + NH₄Cl

NaCl + CH₃ COOH

22. Le-Chatelier’s principle is sometime known as

Law of mass action

All of these

Law of active mass

Law of mobile equilibrium

23. When H₂ and I₂ are mixed and equilibrium is attained, then

HI dissociation stops

The reaction stops completely

None of these

Amount of HI formed is equal to the amount of H₂ dissociated

24. At start of reaction, concentration of reactants are on

Constant

Higher side

Lower side

Optimum side

25. What can affect the magnitude of equilibrium constant Kp of a reversible gaseous reaction

None of these

Pressure

Catalyst

Temperature

Page 2 of 3

26. The equilibrium will shift towards right by increasing ___________ of reactants

Temperature

Pressure

Concentration

Impurity

27. AgCl dissolved with cone (2 x 10¯²) Ksp will be

3.6 x 10¯⁵

4 x 10¯⁴

3.6 x 10¯⁶

7.2 x 10¯⁶

28. When sparingly soluble salt is in equilibrium with molar concentration of its oppositely charged ion when the product is called

Solubility product

Dissociation constant for an acid

Dissociation constant

Common ion effect

29. In reversible reaction the changes in forward and backward reaction occur _________

Both a and b

None

Individually

Simultaneously

30. In which of the following cases, the reaction goes farthest to completion?

K = 10¯²

K = 10⁰

K = 10

K = 10³

31. Kc > Products / Reactants favours

Forward reaction

Reaction completed

Equilibrium

Backward reaction

32. In reversible reactions, if the forward reaction occur very fast then reactant (s) is (are) __________

Solids

Stable

At very high temperature

Unstable

33. Reaction which proceed in both the directions is called

Non spontaneous

Reversible

Irreversible

Spontaneous

34. Water and ice are in equilibrium at 0C° and pressure is applied at this stage, then

More ice is formed

More water is formed

Equilibrium is not disturbed

Water evaporates

35. In an exothermic reversible reaction increase in temp shifts the equilibrium to

Remains unchanged

Fluctuate

Product side

Reactant side

36. The rate at which a substance reacts is directly proportional to its active mass and the rate of reaction is directly proportional to the product of the active mass of reacting substances is known as

Law of mass action

None of all

Le – Chatelier’s principle

Law of conservation of energy

37. Which of the following is more acidic?

Apples

Bread

Bananas

Lemons

38. Addition of CH3COOH and CH3COONa gives in water

Standard solution

Buffer solution

Acidic buffer solution

Both b and c

39. A basic Buffer solution can be prepared by mixing

Weak base and its salt with strong acid

Weak acid and its slat with strong base

Strong base and its salt with weak acid

Strong acid and its slat wit weak base

40. Preparation of buffer solution can be done by mixing

Strong base and its salt with weak acid

Strong acid and its salt with weak base

Weak base and its salt with strong acid

Weak acid and its salt with weak base

41. Temperature for preparation of SO₃ is

200 °C

600 °C

400 – 500 °C

400 °C

42. For equilibrium 2NO₂(g) ⇌ N₂O₄(g) + 14.6 kcal increase of temperature would

Favour the formation of N₂O₄

Stop the reaction

Favour the decomposition of N₂O₄

Not alter the equilibrium

43. When ever a week a base is dissolved in water, it gives its conjugate acid similarly a weal acid in water products its conjugate base. The conjugate acid base pair is stated by

Lowery Bronsted concept

Law of mass action

Le – Chatelier’s principle

Common on effect

44. A buffer solution can be prepared by mixing

A weak acid and weak base

A strong acid and its salt

A strong acid and weak base

A weak base and its salt with strong acid

45. If a buffer solution of higher PH than seven is to be made we use

Weak acid and strong base

Strong acid and strong base

Weak base and its salt with a strong acid

Weak acid and its salt with a strong base

46. Idea of PH and POH was put forward by

Sorenson

Chadwiick

Gibbs

Einstein

47. pH of milk is

6.5

7.5

48. By the addition of base in water pH will be

More than 7

Equal to 7

No effect

Less than 7

49. Conjugate base of a very weak acid is

Do not ionize

Strong base

Weak base

Salt

50. Which of the following factors will favour the reverse reaction in a chemical equilibrium?

Increase in concentration of one of the reactants

Increase in concentration of one of the products

Removal of one of the products regularly

None of these

Page 3 of 3

51. For a reaction H₂ + I₂ ⇌ 2HI at 721 K, the value of equilibrium constant is 50. If 0.5 moles each of H₂ and I₂ is added to the system the value of equilibrium constant will be

0.2

0.02

52. The factor which changes equilibrium constant o the reaction A₂(g) + B₂(g) → 2 AB(g) is

Amounts of A₂ and B₂

Catalyst

Temperature

Total pressure

53. Two moles of HI was heated in a sealed tube at 440°C till the equilibrium was reached. HI was found to be 22% decomposed. The equilibrium constant for dissociation is

0.0199

0.0796

0.282

1.99

54. The relationship between Kp and Kc is give by

Kp = Kc (RT)∆n

Kp = Kc (RT)∆

Kc = Kp (RT)∆n

Kp = Kc (RT)-∆n

55. The state of equilibrium refers to

Dynamic state

State of inertness

State or rest

Stationary state

56. Which pH is considered as basic?

57. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled then the equilibrium constant will

Be halved

Also be doubled

Becomes one fourth

Remains the same

58. The rate of chemical reaction is directly proportional to the active mass of reactant this statement is known as ___________

Law of reaction

Law of Mass Action

None of these

Law of Equilibrium

59. At certain temperature, 50% of HI is dissociated into H₂ and I₂ the equilibrium constant is

3.0

1.0

0.5

0.25

60. PH of human blood is

7.35

7.50

7.00

7.80

61. Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution?

0.4 mole of NH3 with 0.2 mole of HCl

0.4 mole of CH3COOH with 0.4 mole of NaOH

0.2 mole of NaCl with 0.2 mole of HNO3

0.0002M HCl

62. An equilibrium constant of 10¯⁴ for a reaction means that the reaction is

The equilibrium constant only relates to the speed of a reaction and not to the amount of product formed

One that will have 50% product and 50% reactant at equilibrium

One that is unfavourable and will not have very much product at equilibrium

One that is very favorable and will have mostly product at equilibrium

63. The equilibrium constant in a reversible chemical reaction at a given temperature

Depends on the concentration of one of the products at equilibrium

Does not depend on the initial concentrations of reactants

Depends on the initial concentration of the reactants

Is not characteristic of the reaction

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Maan AliLast Updated: April 19, 2025

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ECAT Chemistry Chemical Equilibrium Test Online

Chemistry Chemical Equilibrium MCQS Online Test

ECAT Chemistry Chemical Equilibrium Chapter Online Test

ECAT Chemistry Chemical Equilibrium Test

Chemistry

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Maan Ali

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Chemistry Chemical Equilibrium MCQS Online Test

ECAT Chemistry Chemical Equilibrium Chapter Online Test

ECAT Chemistry Chemical Equilibrium Test

Chemistry

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